VerifierWebWorkerConnectionImpl.java

/*
 * Copyright 2016 Red Hat, Inc. and/or its affiliates.
 *
 * Licensed under the Apache License, Version 2.0 (the "License"); you may not
 * use this file except in compliance with the License. You may obtain a copy of
 * the License at
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
 * WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
 * License for the specific language governing permissions and limitations under
 * the License.
 */
package org.drools.workbench.screens.guided.dtable.client.widget.analysis;

import java.util.logging.Logger;

import com.google.gwt.webworker.client.Worker;
import org.drools.workbench.services.verifier.plugin.client.api.Initialize;
import org.drools.workbench.services.verifier.plugin.client.api.RequestStatus;
import org.uberfire.commons.validation.PortablePreconditions;

public class VerifierWebWorkerConnectionImpl
        implements VerifierWebWorkerConnection {

    private static final Logger LOGGER = Logger.getLogger( "DTable Analyzer" );

    private Worker worker = null;

    private final Poster poster;
    private final Receiver receiver;
    private final Initialize initialize;

    public VerifierWebWorkerConnectionImpl( final Initialize initialize,
                                            final Poster poster,
                                            final Receiver receiver ) {

        this.initialize = PortablePreconditions.checkNotNull( "initialize",
                                                              initialize );
        this.poster = PortablePreconditions.checkNotNull( "poster",
                                                          poster );
        this.receiver = PortablePreconditions.checkNotNull( "receiver",
                                                            receiver );

        LOGGER.finest( "Created Web Worker" );
    }

    private void startWorker() {
        worker = Worker.create( "verifier/verifier.nocache.js" );

        poster.setUp( worker );
        receiver.setUp( worker );
    }

    @Override
    public void activate() {

        receiver.activate();

        if ( worker == null ) {
            startWorker();
            poster.post( initialize );
        } else {
            poster.post( new RequestStatus() );
        }
    }

    @Override
    public void terminate() {
        if ( worker != null ) {
            worker.terminate();
        }
    }
}